At the Sega screen: Hold the reload button and press Up, Down, Left,
 Right. At the AM2 screen: Hold the reload button and press Down, Up,
 Right, Left, Up, Up, Left, Right.
 
 Note: if you are using the mouse; switch to keyboard or joystick and
 then enter the codes. When done, switch back to mouse.
 
 After entering these codes you will be able to select Ranking Mode,
 Freeplay, 9 Difficulty levels, Options Plus menu, Japanese Language,
 Mirror Mode, Gun Select (pause the game while playing with F3 and use
 Reload button to select the gun you want, includ